System and method for measuring golf ball striking information

ABSTRACT

A system and method for measuring golf ball striking information includes a floor sensor array for detecting the space velocity and position of a golf ball or detecting the speed of a club head and the trajectory of a circle drawn by the club head; a floor light source emission array for emitting a light source to the floor sensor array from a position corresponding to the floor sensor array; a horizontal sensor array for detecting the entry angle and speed of the club head by left-handed hitting or right-handed hitting; and a horizontal light source emission array for emitting a light source to the horizontal floor sensor array from a position corresponding to the horizontal sensor array.

TECHNICAL FIELD

The present invention relates to a system and method for measuring golf ball striking information, in which when a player hits a golf ball by left-handed hitting or right-handed hitting in a screen golf system, the shadow of the golf ball flying and the shadow of a club head swung by the left-handed hitting or right-handed hitting can be detected by light sensors, and the space velocity and space vector of the golf ball, the speed and horizontal trajectory of the club head, and the entry angle and speed of the club head can be measured using the detected shadow information.

BACKGROUND ART

Recently, a screen golf system has been commercialized which provides an indoor environment similar to that of an outdoor golf course such that a golf player feels as if he or she hits or putts a golf ball at an actual outdoor golf course.

In this screen golf system, a surrounding environment similar to that of an actual outdoor golf course is provided and an image of the surrounding environment is displayed such that the golf player selects a golf club for hitting the golf ball and hits or putts the golf ball placed on the floor toward a screen.

When the golf player hits or putts the golf ball, a main computer detects the club head swung by the golf player and the golf ball flying by the hit by means of a plurality of sensors to analyze the swing and displays the speed, direction, and launch angle of the golf ball flying by the hit, the trajectory of the club head, etc. based on the analysis results.

In prior art screen golf systems, a system for measuring flight position and speed of a circular object using a light screen (Korean Patent Application Publication No. 2003-0077379) is configured to calculate the flight position and speed of the circular object by analyzing shadow information on a light screen, formed when the circular object passes through the light screen, configured to cross the flight path of the circular object and to determine the flight trajectory based on the calculated information. This system can be used by both left- and right-handed hitters in the screen golf system and can measure and simulate the spatial velocity vector of the flying object. However, the above system cannot measure the amount of spin with respect to X, Y, and Z axes, and thus the accuracy of the simulation is reduced, which is problematic.

Meanwhile, according to an analysis system of golf ball and head information using lasers and 4-axis light sensing (Korean Patent Application Publication No. 2006-0114969) filed by the present applicant, when a golf ball is hit at a golf practice range, the shadows of the flying ball and the club head are detected, and the speed of the ball, the speed of the club head, the direction angle/launch angle of the ball, the path of the club head, the ball action, and the driving distance are calculated and provided on a screen. This system can increase the accuracy of the simulation by obtaining both the side spin and back spin of the golf ball based on the information such as the flight speed and direction (spatial velocity vector), the space velocity and trajectory of the club head, etc. However, it cannot be used by both left- and right-handed hitters due to the presence of sensors mounted to project from both sides, which is also problematic.

DISCLOSURE Technical Problem

Accordingly, the present invention has been made to solve the above-described problems, and an object of the present invention is to a system and method for measuring golf ball striking information, in which when a player hits a golf ball by left-handed hitting or right-handed hitting in a screen golf system, the shadow of the golf ball flying and the shadow of a club head swung by the left-handed hitting or right-handed hitting can be detected by light sensors, and the space velocity and space vector of the golf ball, the speed and horizontal trajectory of the club head, and the entry angle and speed of the club head can be measured using the detected shadow information.

Technical Solution

To accomplish the above objects of the present invention, there is provided a system for measuring golf ball striking information, the system comprising: a floor sensor array for detecting the space velocity and position of a golf ball or detecting the speed of a club head and the trajectory of a circle drawn by the club head; a floor light source emission array for emitting a light source to the floor sensor array from a position corresponding to the floor sensor array; a horizontal sensor array for detecting the entry angle and speed of the club head by left-handed hitting or right-handed hitting; and a horizontal light source emission array for emitting a light source to the horizontal floor sensor array from a position corresponding to the horizontal sensor array.

The floor sensor array comprises a first floor sensor, a second floor sensor, a third floor sensor, and a third floor sensor, which receive a light emitted from the floor light source emission array, respectively, detect the shadows of the golf ball and the club head according to their movements, and are provided at regular intervals on the floor.

The floor light source emission array comprises a first light source for emitting a light toward the first floor sensor, a second light source for emitting a light toward the second floor sensor, a third light source for emitting a light toward the third floor sensor, and a fourth light source for emitting a light toward the fourth floor sensor, which are provided at a predetermined height from the floor.

The system measures the size of a shadow and the central point of the shadow, formed when the golf ball passes through a third sensing surface formed by the light source emitted from the third light source to the third floor sensor and a fourth sensing surface formed by the light source emitted from the fourth light source to the fourth floor sensor, using the position of the third light source, the position of the fourth light source, the position of the third floor sensor, and the position of the fourth floor sensor to calculate spatial position coordinates of the golf ball, which passes through the third sensing surface and the fourth sensing surface, and calculates a flight vector of the golf ball in a space by connecting points of the calculated spatial position coordinates.

The system calculates a movement distance from the spatial position coordinates of the golf ball calculated from the third sensing surface and the fourth sensing surface and calculates the space velocity of the golf ball using a time difference between the respectively points.

The system comprises a first sensing surface formed by the light source emitted from the first light source to the first floor sensor using the position of the first light source and the position of the first floor sensor, a second sensing surface formed by the light source emitted from the second light source to the second floor sensor using the position of the second light source and the position of the second floor sensor, and a third sensing surface formed by the light source emitted from the third light source to the third floor sensor using the position of the third light source and the position of the third floor sensor, calculates three position coordinates of the club head, which meet each other when the club head passes through the first sensing surface, the second sensing surface, and the third sensing surface, calculates an equation of a circle drawn by the trajectory of the club head using the three position coordinates of the club head, and calculates an equation of a tangent line at a point where the golf ball is present by substituting the spatial position coordinates into the equation of the circle.

The system calculates an entry speed of the club head using the movement distance and movement time of the club head when it passes through the respective sensing surfaces.

The horizontal sensor array comprises a first horizontal sensor and a second horizontal sensor for measuring the entry angle and entry speed of the club head by left-handed hitting and a third horizontal sensor and a fourth horizontal sensor for measuring the entry angle and entry speed of the club head by right-handed hitting.

The system calculates an entry vector of the club head by connecting sensor measurement points generated when the club head by left-handed hitting passes through the first horizontal sensor and the second horizontal sensor.

The system calculates an entry vector of the club head by connecting sensor measurement points generated when the club head by right-handed hitting passes through the third horizontal sensor and the fourth horizontal sensor.

To accomplish the above objects of the present invention, there is provided a method for measuring golf ball striking information, implemented by a system which emits a light source from a first light source to a first floor sensor, from a second light source to a second floor sensor, from a third light source to a third floor sensor, and from a fourth light source to a fourth floor sensor and, at the same time, emits a light source from a first horizontal light source to a first horizontal sensor, from a second horizontal light source to a second horizontal sensor, from a third horizontal light source to a third horizontal sensor, and from a fourth horizontal light source to a fourth horizontal sensor, the method comprising the steps of: (a) calculating the space velocity and position of a golf ball by means of the third floor sensor and the fourth floor sensor; (b) calculating the speed of a club head that strikes the golf ball and the trajectory of a circle drawn by the club head by means of the first floor sensor, the second floor sensor, and the third floor sensor; and (c) calculating the entry angle and speed of the club head by left-handed hitting by means of the first horizontal sensor and the second horizontal sensor or calculating the entry angle and speed of the club head by right-handed hitting by means of the third horizontal sensor and the fourth horizontal sensor.

Step (c) comprises measuring the size of a shadow and the central point of the shadow, formed when the golf ball passes through a third sensing surface formed by the light source emitted from the third light source to the third floor sensor and a fourth sensing surface formed by the light source emitted from the fourth light source to the fourth floor sensor, to calculate spatial position coordinates of the golf ball, which passes through the third sensing surface and the fourth sensing surface, and calculating a flight vector of the golf ball in a space by connecting points of the calculated spatial position coordinates.

Step (a) comprises calculating a movement distance from the spatial position coordinates of the golf ball calculated from the third sensing surface and the fourth sensing surface and calculating the space velocity of the golf ball using a time difference between the respectively points.

Step (b) comprises calculating a first sensing surface formed by the light source emitted from the first light source to the first floor sensor using the position of the first light source and the position of the first floor sensor, a second sensing surface formed by the light source emitted from the second light source to the second floor sensor using the position of the second light source and the position of the second floor sensor, and a third sensing surface formed by the light source emitted from the third light source to the third floor sensor using the position of the third light source and the position of the third floor sensor, calculating three position coordinates of the club head, which meet each other when the club head passes through the first sensing surface, the second sensing surface, and the third sensing surface, calculating an equation of a circle drawn by the trajectory of the club head using the three position coordinates of the club head, and calculating an equation of a tangent line at a point where the golf ball is present by substituting the spatial position coordinates into the equation of the circle.

The method further comprises calculating an entry speed of the club head using the movement distance and movement time of the club head when it passes through the respective sensing surfaces.

Step (c) comprises calculating an entry vector of the club head by connecting sensor measurement points generated when the club head by left-handed hitting passes through the first horizontal sensor and the second horizontal sensor.

Step (c) comprises calculating an entry vector of the club head by connecting sensor measurement points generated when the club head by right-handed hitting passes through the third horizontal sensor and the fourth horizontal sensor.

Advantageous Effects

According to the present invention, a player who uses a screen golf system can hit a golf ball regardless of whether he or she is a left-handed or right-handed player and can improve his or her practice based on golf ball striking information.

DESCRIPTION OF DRAWINGS

FIG. 1 is a diagram showing the configuration of a golf ball striking information measurement system in accordance with an embodiment of the present invention.

FIG. 2 is a diagram showing a floor sensor array and a horizontal sensor array viewed from the front in accordance with an embodiment of the present invention.

FIG. 3 is a diagram showing a floor sensor array and a horizontal sensor array viewed from the side in accordance with an embodiment of the present invention.

FIG. 4 is a flowchart showing a golf ball striking information measurement method in accordance with an embodiment of the present invention.

FIG. 5 is a diagram showing the principle of calculating spatial position coordinates and flight speed of a golf ball in accordance with an embodiment of the present invention.

FIG. 6 is a diagram showing the principle of measuring a horizontal trajectory of a club head and the principle of calculating a tangent vector that passes through a golf ball in accordance with an embodiment of the present invention.

FIG. 7 is a diagram showing the principle of calculating an entry angle of a club head in accordance with an embodiment of the present invention.

MODE FOR INVENTION

Hereinafter, detailed contents about the above-described objects, technical configurations, and operational effects thereof of the present invention will be more clearly understood from the following detailed description of the present invention, which will be described with reference to the attached drawings.

FIG. 1 is a diagram showing the configuration of a golf ball striking information measurement system in accordance with an embodiment of the present invention.

Referring to FIG. 1, a golf ball striking information measurement system 100 according to the present invention comprises a floor sensor array 110, a floor light source emission array 120, a horizontal sensor array 130, and a horizontal light source emission array 140.

The floor sensor array 110 detects the space velocity and position of a golf ball or detects the speed of a club head and the trajectory of a circle drawn by the club head. Accordingly, the floor sensory array 110 comprises a first floor sensor 112, a second floor sensor 114, a third floor sensor 116, and a fourth floor sensor 118, which receive a light emitted from the floor light source emission array 120, respectively, and detect the shadows of the golf ball and the club head according to their movements. As shown in FIGS. 2 and 3, the first floor sensor 112, the second floor sensor 114, the third floor sensor 116, and the fourth floor sensor 118 are provided at regular intervals on the floor. FIG. 2 is a diagram showing a floor sensor array and a horizontal sensor array viewed from the front in accordance with an embodiment of the present invention, and FIG. 3 is a diagram showing a floor sensor array and a horizontal sensor array viewed from the side in accordance with an embodiment of the present invention.

The floor light source emission array 120 emits a light source to the floor sensor array 110 from a position corresponding to the floor sensor array 110. Here, as shown in FIG. 1, the floor light source emission array 120 comprises a first light source 122 for emitting a light toward the first floor sensor 112, a second light source 124 for emitting a light toward the second floor sensor 114, a third light source 126 for emitting a light toward the third floor sensor 116, and a fourth light source 128 for emitting a light toward the fourth floor sensor 118, which are provided at a predetermined height from the floor.

Moreover, the golf ball striking information measurement system 100 measures the size of a shadow and the central point of the shadow, formed when the golf ball passes through a third sensing surface C formed by the light source emitted from the third light source 126 to the third floor sensor 116 and a fourth sensing surface D formed by the light source emitted from the fourth light source 128 to the fourth floor sensor 118, using the position of the third light source 126, the position of the fourth light source 128, the position of the third floor sensor 116, and the position of the fourth floor sensor 118 to calculate spatial position coordinates of the golf ball, which passes through the third sensing surface C and the fourth sensing surface D, and calculates a flight vector of the golf ball in a space by connecting points of the calculated spatial position coordinates.

Furthermore, the golf ball striking information measurement system 100 calculates a movement distance from the spatial position coordinates of the golf ball calculated from a first sensing surface A and a second sensing surface B and calculates a space velocity of the golf ball using a time difference between the respectively points.

In addition, the golf ball striking information measurement system 100 creates the first sensing surface A formed by the light source emitted from the first light source 122 to the first floor sensor 112 using the position of the first light source 122 and the position of the first floor sensor 112, the second sensing surface B formed by the light source emitted from the second light source 124 to the second floor sensor 114 using the position of the second light source 124 and the position of the second floor sensor 114, and the third sensing surface C formed by the light source emitted from the third light source 126 to the third floor sensor 116 using the position of the third light source 126 and the position of the third floor sensor 116, calculates three position coordinates of the club head, which meet each other when the club head passes through the first sensing surface A, the second sensing surface B, and the third sensing surface C, calculates an equation of a circle drawn by the trajectory of the club head using the three position coordinates of the club head, and calculates an equation of a tangent line at a point where the golf ball is present by substituting the spatial position coordinates into the equation of the circle.

Moreover, the golf ball striking information measurement system 100 calculates an entry speed of the club head using the movement distance and movement time of the club head when it passes through the respective sensing surfaces A, B, and C.

The horizontal sensor array 130 detects the entry angle and speed of the club head by left-handed hitting or right-handed hitting. Moreover, the horizontal sensor array 130 comprises a first horizontal sensor 132 and a second horizontal sensor 134 for measuring the entry angle and entry speed of the club head by left-handed hitting and a third horizontal sensor 136 and a fourth horizontal sensor 138 for measuring the entry angle and entry speed of the club head by right-handed hitting.

The horizontal light source emission array 140 emits a light source to the horizontal sensor array 130 from a position corresponding to the horizontal sensor array 130. Here, the horizontal light source emission array 140 comprises a first horizontal light source 142 positioned to face the first horizontal sensor 132, a second horizontal light source 144 positioned to face the second horizontal sensor 134, a third horizontal light source 146 positioned to face the third horizontal sensor 136, and a fourth horizontal light source 148 positioned to face the fourth horizontal sensor 138.

Furthermore, the golf ball striking information measurement system 100 calculates an entry vector of the club head by connecting sensor measurement points generated when the club head by left-handed hitting passes through the first horizontal sensor 132 and the second horizontal sensor 134.

In addition, the golf ball striking information measurement system 100 calculates an entry vector of the club head by connecting sensor measurement points generated when the club head by right-handed hitting passes through the third horizontal sensor 136 and the fourth horizontal sensor 138.

FIG. 4 is a flowchart showing a golf ball striking information measurement method in accordance with an embodiment of the present invention.

Referring to FIG. 4, the golf ball striking information measurement system 100 according to the present invention emits a light source from the first light source 122 to the first floor sensor 112, from the second light source 124 to the second floor sensor 114, from the third light source 126 to the third floor sensor 116, and from the fourth light source 128 to the fourth floor sensor 118 and, at the same time, emits a light source from the first horizontal light source 142 to the first horizontal sensor 132, from the second horizontal light source 144 to the second horizontal sensor 134, from the third horizontal light source 146 to the third horizontal sensor 136, and from the fourth horizontal light source 148 to the fourth horizontal sensor 138, to measure the space velocity and position of the golf ball by means of the third floor sensor 116 and the fourth floor sensor 118 (S410).

That is, as shown in FIG. 5, the golf ball striking information measurement system 100 measures the size of a shadow and the central point of the shadow, formed when the golf ball passes through the third sensing surface C formed by the light source emitted from the third light source 126 to the third floor sensor 116 and the fourth sensing surface D formed by the light source emitted from the fourth light source 128 to the fourth floor sensor 118 to calculate the spatial position coordinates of the golf ball, which passes through the third sensing surface C and the fourth sensing surface D, and calculates the flight velocity vector of the golf ball in a space by connecting points of the calculated spatial position coordinates. FIG. 5 is a diagram showing the principle of calculating spatial position coordinates and flight speed of a golf ball in accordance with an embodiment of the present invention.

Moreover, the golf ball striking information measurement system 100 calculates a movement distance from the spatial position coordinates of the golf ball calculated from the third sensing surface C and the fourth sensing surface D and calculates a space velocity of the golf ball using a time difference between the respectively points.

Then, the golf ball striking information measurement system 100 calculates the speed of the club head that strikes the golf ball and the trajectory of a circle drawn by the club head by means of the first floor sensor 112, the second floor sensor 114, and the third floor sensor 116 (S420).

That is, the golf ball striking information measurement system 100 creates the first sensing surface A formed by the light source emitted from the first light source 122 to the first floor sensor 112 using the position of the first light source 122 and the position of the first floor sensor 112, the second sensing surface B formed by the light source emitted from the second light source 124 to the second floor sensor 114 using the position of the second light source 124 and the position of the second floor sensor 114, and the third sensing surface C formed by the light source emitted from the third light source 126 to the third floor sensor 116 using the position of the third light source 126 and the position of the third floor sensor 116, calculates three position coordinates of the club head, which meet each other when the club head passes through the first sensing surface A, the second sensing surface B, and the third sensing surface C as shown in FIG. 6, calculates an equation of a circle drawn by the trajectory of the club head using the three position coordinates of the club head, and calculates an equation of a tangent line at a point where the golf ball is present by substituting the spatial position coordinates into the equation of the circle. FIG. 6 is a diagram showing the principle of measuring a horizontal trajectory of a club head and the principle of calculating a tangent vector that passes through a golf ball in accordance with an embodiment of the present invention.

Moreover, the golf ball striking information measurement system 100 calculates an entry speed of the club head using the movement distance and movement time of the club head when it passes through the respective sensing surfaces A, B, and C.

Furthermore, as shown in FIG. 7, the golf ball striking information measurement system 100 calculates the entry vector and speed of the club head by left-handed hitting by means of the first horizontal sensor 132 and the second horizontal sensor 134 or calculates the entry vector and speed of the club head by right-handed hitting by means of the third horizontal sensor 136 and the fourth horizontal sensor 138 (S430). Here, FIG. 7 is a diagram showing the principle of calculating an entry angle of a club head in accordance with an embodiment of the present invention.

Moreover, the golf ball striking information measurement system 100 calculates an entry vector of the club head by connecting sensor measurement points generated when the club head by left-handed hitting passes through the first horizontal sensor 132 and the second horizontal sensor 134.

Furthermore, the golf ball striking information measurement system 100 calculates an entry vector of the club head by connecting sensor measurement points generated when the club head by right-handed hitting passes through the third horizontal sensor 136 and the fourth horizontal sensor 138.

As described above, according to the present invention, it is possible to realize the system and method for measuring golf ball striking information, in which when the player hits the golf ball by left-handed hitting or right-handed hitting in the screen golf system, the shadow of the golf ball flying and the shadow of a club head swung by the left-handed hitting or right-handed hitting can be detected by the light sensors, and the space velocity and space vector of the golf ball, the speed and horizontal trajectory of the club head, and the entry angle and speed of the club head can be measured using the detected shadow information.

It will be understood by those skilled in the art to which the present invention pertains that the present invention can be implemented in other specific forms without changing the technical spirit or essential features of the present invention. Therefore, it should be noted that the forgoing embodiments are merely illustrative in all aspects and are not to be construed as limiting the invention. The scope of the invention is defined by the appended claims rather than the detailed description of the invention. All changes or modifications or their equivalents made within the meanings and scope of the claims should be construed as falling within the scope of the invention.

INDUSTRIAL APPLICABILITY

The present invention can be applied to a system or service that allows a golf player to use golf ball striking information obtained when he or she hits a golf ball, regardless of whether he or she is a left-handed or right-handed player, in an indoor golf practice range or screen golf system. 

1. A system for measuring golf ball striking information, the system comprising: a floor sensor array for detecting the space velocity and position of a golf ball or detecting the speed of a club head and the trajectory of a circle drawn by the club head; a floor light source emission array for emitting a light source to the floor sensor array from a position corresponding to the floor sensor array; a horizontal sensor array for detecting the entry angle and speed of the club head by left-handed hitting or right-handed hitting; and a horizontal light source emission array for emitting a light source to the horizontal floor sensor array from a position corresponding to the horizontal sensor array.
 2. The system of claim 1, wherein the floor sensor array comprises a first floor sensor, a second floor sensor, a third floor sensor, and a third floor sensor, which receive a light emitted from the floor light source emission array, respectively, detect the shadows of the golf ball and the club head according to their movements, and are provided at regular intervals on the floor.
 3. The system of claim 2, wherein the floor light source emission array comprises a first light source for emitting a light toward the first floor sensor, a second light source for emitting a light toward the second floor sensor, a third light source for emitting a light toward the third floor sensor, and a fourth light source for emitting a light toward the fourth floor sensor, which are provided at a predetermined height from the floor.
 4. The system of claim 3, wherein the system measures the size of a shadow and the central point of the shadow, formed when the golf ball passes through a third sensing surface formed by the light source emitted from the third light source to the third floor sensor and a fourth sensing surface formed by the light source emitted from the fourth light source to the fourth floor sensor, using the position of the third light source, the position of the fourth light source, the position of the third floor sensor, and the position of the fourth floor sensor to calculate spatial position coordinates of the golf ball, which passes through the third sensing surface and the fourth sensing surface, and calculates a flight vector of the golf ball in a space by connecting points of the calculated spatial position coordinates.
 5. The system of claim 4, wherein the system calculates a movement distance from the spatial position coordinates of the golf ball calculated from the third sensing surface and the fourth sensing surface and calculates the space velocity of the golf ball using a time difference between the respectively points.
 6. The system of claim 3, wherein the system comprises a first sensing surface formed by the light source emitted from the first light source to the first floor sensor using the position of the first light source and the position of the first floor sensor, a second sensing surface formed by the light source emitted from the second light source to the second floor sensor using the position of the second light source and the position of the second floor sensor, and a third sensing surface formed by the light source emitted from the third light source to the third floor sensor using the position of the third light source and the position of the third floor sensor, calculates three position coordinates of the club head, which meet each other when the club head passes through the first sensing surface, the second sensing surface, and the third sensing surface, calculates an equation of a circle drawn by the trajectory of the club head using the three position coordinates of the club head, and calculates an equation of a tangent line at a point where the golf ball is present by substituting the spatial position coordinates into the equation of the circle.
 7. The system of claim 6, wherein the system calculates an entry speed of the club head using the movement distance and movement time of the club head when it passes through the respective sensing surfaces.
 8. The system of claim 1, wherein the horizontal sensor array comprises a first horizontal sensor and a second horizontal sensor for measuring the entry angle and entry speed of the club head by left-handed hitting and a third horizontal sensor and a fourth horizontal sensor for measuring the entry angle and entry speed of the club head by right-handed hitting.
 9. The system of claim 8, wherein the system calculates an entry vector of the club head by connecting sensor measurement points generated when the club head by left-handed hitting passes through the first horizontal sensor and the second horizontal sensor.
 10. The system of claim 8, wherein the system calculates an entry vector of the club head by connecting sensor measurement points generated when the club head by right-handed hitting passes through the third horizontal sensor and the fourth horizontal sensor.
 11. A method for measuring golf ball striking information, implemented by a system which emits a light source from a first light source to a first floor sensor, from a second light source to a second floor sensor, from a third light source to a third floor sensor, and from a fourth light source to a fourth floor sensor and, at the same time, emits a light source from a first horizontal light source to a first horizontal sensor, from a second horizontal light source to a second horizontal sensor, from a third horizontal light source to a third horizontal sensor, and from a fourth horizontal light source to a fourth horizontal sensor, the method comprising the steps of: (a) calculating the space velocity and position of a golf ball by means of the third floor sensor and the fourth floor sensor; (b) calculating the speed of a club head that strikes the golf ball and the trajectory of a circle drawn by the club head by means of the first floor sensor, the second floor sensor, and the third floor sensor; and (c) calculating the entry angle and speed of the club head by left-handed hitting by means of the first horizontal sensor and the second horizontal sensor or calculating the entry angle and speed of the club head by right-handed hitting by means of the third horizontal sensor and the fourth horizontal sensor.
 12. The method of claim 11, wherein step (c) comprises measuring the size of a shadow and the central point of the shadow, formed when the golf ball passes through a third sensing surface formed by the light source emitted from the third light source to the third floor sensor and a fourth sensing surface formed by the light source emitted from the fourth light source to the fourth floor sensor, to calculate spatial position coordinates of the golf ball, which passes through the third sensing surface and the fourth sensing surface, and calculating a flight vector of the golf ball in a space by connecting points of the calculated spatial position coordinates.
 13. The method of claim 12, wherein step (a) comprises calculating a movement distance from the spatial position coordinates of the golf ball calculated from the third sensing surface and the fourth sensing surface and calculating the space velocity of the golf ball using a time difference between the respectively points.
 14. The method of claim 11, wherein step (b) comprises calculating a first sensing surface formed by the light source emitted from the first light source to the first floor sensor using the position of the first light source and the position of the first floor sensor, a second sensing surface formed by the light source emitted from the second light source to the second floor sensor using the position of the second light source and the position of the second floor sensor, and a third sensing surface formed by the light source emitted from the third light source to the third floor sensor using the position of the third light source and the position of the third floor sensor, calculating three position coordinates of the club head, which meet each other when the club head passes through the first sensing surface, the second sensing surface, and the third sensing surface, calculating an equation of a circle drawn by the trajectory of the club head using the three position coordinates of the club head, and calculating an equation of a tangent line at a point where the golf ball is present by substituting the spatial position coordinates into the equation of the circle.
 15. The method of claim 14, further comprising calculating an entry speed of the club head using the movement distance and movement time of the club head when it passes through the respective sensing surfaces.
 16. The method of claim 11, wherein step (c) comprises calculating an entry vector of the club head by connecting sensor measurement points generated when the club head by left-handed hitting passes through the first horizontal sensor and the second horizontal sensor.
 17. The method of claim 11, wherein step (c) comprises calculating an entry vector of the club head by connecting sensor measurement points generated when the club head by right-handed hitting passes through the third horizontal sensor and the fourth horizontal sensor. 